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What Does a Commercial Gas Engineer Do? Commercial gas engineers are employed on a variety of equipment that include boilers and heating systems. They can also install and maintain ductwork. Some use their technical expertise to increase energy efficiency and comply with regulations. Some also take on managerial roles or even start their own businesses. This is a mobile job that involves working in multiple locations. Communication and travel skills are essential. Installation If you're thinking of making a career change to a different field, becoming a commercial ga